I will add to others’ comments, that although this is the default on the communities list, make sure the “Local” option is selected to see all communities on the specific instance or “All” to see all communities the instance federates with (in other words, all the communities it allows access to)
What Reddit did 2 years ago proves that most people aren’t going to switch to alternatives just because it’s “the right thing”. They only do that when they want or need something from the new platform. If we want people to come to Lemmy, Matrix, and whatnot else, we have to make them into appealing alternatives both in functionality and content.